[INFO] fetching crate discord-retention-bot 1.0.2...
[INFO] testing discord-retention-bot-1.0.2 against 1.54.0 for beta-1.55-1
[INFO] extracting crate discord-retention-bot 1.0.2 into /workspace/builds/worker-101/source
[INFO] validating manifest of crates.io crate discord-retention-bot 1.0.2 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate discord-retention-bot 1.0.2
[INFO] finished tweaking crates.io crate discord-retention-bot 1.0.2
[INFO] tweaked toml for crates.io crate discord-retention-bot 1.0.2 written to /workspace/builds/worker-101/source/Cargo.toml
[INFO] crate crates.io crate discord-retention-bot 1.0.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9ce4d08e6d7ea5a46b3d852d038dd2ead4ef817c0feb25cfbcd6084291588c64
[INFO] running `Command { std: "docker" "start" "-a" "9ce4d08e6d7ea5a46b3d852d038dd2ead4ef817c0feb25cfbcd6084291588c64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ce4d08e6d7ea5a46b3d852d038dd2ead4ef817c0feb25cfbcd6084291588c64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ce4d08e6d7ea5a46b3d852d038dd2ead4ef817c0feb25cfbcd6084291588c64", kill_on_drop: false }`
[INFO] [stdout] 9ce4d08e6d7ea5a46b3d852d038dd2ead4ef817c0feb25cfbcd6084291588c64
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 27a9763b974bcef9864541ebd527052eaa16e9a4ce54b9b2ee63bf33588f60b8
[INFO] running `Command { std: "docker" "start" "-a" "27a9763b974bcef9864541ebd527052eaa16e9a4ce54b9b2ee63bf33588f60b8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.53
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling once_cell v1.5.2
[INFO] [stderr]    Compiling futures-core v0.3.8
[INFO] [stderr]    Compiling bytes v0.5.6
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]    Compiling futures-sink v0.3.8
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling untrusted v0.7.1
[INFO] [stderr]    Compiling futures-io v0.3.8
[INFO] [stderr]    Compiling pin-project-internal v0.4.27
[INFO] [stderr]    Compiling pin-project-lite v0.2.0
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling pin-project-lite v0.1.11
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling base64 v0.12.3
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling encoding_rs v0.8.26
[INFO] [stderr]    Compiling cpuid-bool v0.1.2
[INFO] [stderr]    Compiling httpdate v0.3.2
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling serde_json v1.0.60
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling adler v0.2.3
[INFO] [stderr]    Compiling utf-8 v0.7.5
[INFO] [stderr]    Compiling regex-syntax v0.6.21
[INFO] [stderr]    Compiling serenity v0.9.2
[INFO] [stderr]    Compiling anyhow v1.0.35
[INFO] [stderr]    Compiling ipnet v2.3.0
[INFO] [stderr]    Compiling typemap_rev v0.1.4
[INFO] [stderr]    Compiling humantime v2.0.1
[INFO] [stderr]    Compiling termcolor v1.1.2
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling tinyvec v1.1.0
[INFO] [stderr]    Compiling tracing-core v0.1.17
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling form_urlencoded v1.0.0
[INFO] [stderr]    Compiling futures-task v0.3.8
[INFO] [stderr]    Compiling futures-channel v0.3.8
[INFO] [stderr]    Compiling http v0.2.1
[INFO] [stderr]    Compiling input_buffer v0.3.1
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling tokio v0.3.5
[INFO] [stderr]    Compiling unicode-normalization v0.1.16
[INFO] [stderr]    Compiling ring v0.16.19
[INFO] [stderr]    Compiling aho-corasick v0.7.15
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[INFO] [stderr]    Compiling net2 v0.2.37
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling socket2 v0.3.17
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling regex v1.4.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling sha-1 v0.9.2
[INFO] [stderr]    Compiling flate2 v1.0.19
[INFO] [stderr]    Compiling url v2.2.0
[INFO] [stderr]    Compiling tokio-test v0.3.0
[INFO] [stderr]    Compiling env_logger v0.8.2
[INFO] [stderr]    Compiling http-body v0.3.1
[INFO] [stderr]    Compiling tungstenite v0.11.1
[INFO] [stderr]    Compiling webpki v0.21.4
[INFO] [stderr]    Compiling sct v0.6.0
[INFO] [stderr]    Compiling rustls v0.18.1
[INFO] [stderr]    Compiling webpki-roots v0.20.0
[INFO] [stderr]    Compiling pin-project-internal v1.0.2
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling futures-macro v0.3.8
[INFO] [stderr]    Compiling tracing-attributes v0.1.11
[INFO] [stderr]    Compiling async-trait v0.1.42
[INFO] [stderr]    Compiling thiserror-impl v1.0.22
[INFO] [stderr]    Compiling tokio v0.2.23
[INFO] [stderr]    Compiling thiserror v1.0.22
[INFO] [stderr]    Compiling tracing v0.1.22
[INFO] [stderr]    Compiling pin-project v1.0.2
[INFO] [stderr]    Compiling futures-util v0.3.8
[INFO] [stderr]    Compiling pin-project v0.4.27
[INFO] [stderr]    Compiling tracing-futures v0.2.4
[INFO] [stderr]    Compiling tokio-util v0.3.1
[INFO] [stderr]    Compiling tokio-rustls v0.14.1
[INFO] [stderr]    Compiling h2 v0.2.7
[INFO] [stderr]    Compiling futures-executor v0.3.8
[INFO] [stderr]    Compiling async-tungstenite v0.9.3
[INFO] [stderr]    Compiling futures v0.3.8
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling hyper v0.13.9
[INFO] [stderr]    Compiling hyper-rustls v0.21.0
[INFO] [stderr]    Compiling reqwest v0.10.9
[INFO] [stderr]    Compiling discord-retention-bot v1.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_closure)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `discord-retention-bot`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "27a9763b974bcef9864541ebd527052eaa16e9a4ce54b9b2ee63bf33588f60b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27a9763b974bcef9864541ebd527052eaa16e9a4ce54b9b2ee63bf33588f60b8", kill_on_drop: false }`
[INFO] [stdout] 27a9763b974bcef9864541ebd527052eaa16e9a4ce54b9b2ee63bf33588f60b8
